Ka-Band Single-Layer High-Efficiency Circular Aperture Microstrip Array Antenna

Table 2

Comparison with other reported planar array antennas.

Ref.	f0 (GHz)	Max gain (dBi)	Number of elements	Impedance bandwidth (%)	Aperture size	Radiation/aperture efficiency (%)	Configuration	Feeding mechanism	Circular aperture design	Design complexity
[2]	14.25	24.5	256	5.6	13.3λ0 × 12.35λ0	20/N.A.	Single-layer PCB	Microstrip feeding	Not suitable	Easy
[6]	37.5	24	64	16	6.4λ0 × 6.4λ0	41.6/N.A.	3-layer PCB + air gap	PRGW feeding	Not suitable	Difficult
[5]	34	17.4	16	35.5	∼5.25λ0 × 5.25λ0	N.A./25	3-layer PCB	SIGW feeding	Not suitable	Difficult
[8]	28	21.8	42	6.3	N.A.	N.A./21.2	2-layer PCB	SIW feeding	Not suitable	Easy
This work	35	29.5	256	4.6	π × 7λ0 × 7λ0	61.66/46.07	Single-layer PCB	Microstrip feeding	Suitable	Difficult